True,A state possesses secure second strike capabilities when all of its nuclear weapons can be destroyed in an initial preemptive strike by an adversary.
What is nuclear weapons ?
A nuclear weapon is an explosive device whose destructive force is derived from nuclear processes, either fission or a mixture of fission and fusion reactions, resulting in a nuclear explosion. Both types of bombs produce a significant quantity of energy from relatively small amounts of stuff.
A handful of US nuclear warheads may require newly created plutonium pits, which have an expected lifespan of 80-90 years, to ensure they continue to work till the end of the century.
There are no known gun-type weapons in service today: advanced nuclear weapon states have mostly abandoned the concept in favor of implosion-type bombs, boosted fission weapons, and thermonuclear weapons. Only enhanced fission and thermonuclear weapons are developed by new nuclear weapon states.
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